Prince William of Gloucester
Prince William of Gloucester (William Henry Andrew Frederick; 18 December 1941 – 28 August 1972) was a member of the British royal family. The elder son of Prince Henry, Duke of Gloucester, and Princess Alice, Duchess of Gloucester, he was a grandson of George V, nephew of Edward VIII and George VI, and first cousin of Elizabeth II. At birth, he was fourth in line to the throne; by the time of his death, he was ninth.
Source: Wikipedia — Prince William of Gloucester (CC BY-SA 4.0)